There is an PHP fonction to HightLight a word in a string but not case sensitive/accent sensitive?-CodePudding

There is a PHP function that can highlight a word regardless of case or accents, but the string returned will be the original string with only the highlighting? For example:

Function highlight($string, $term_to_search){
// ...
}
echo highlight("my Striñg", "string")
// Result: "my <b>Striñg</b>"

Thanks in advance!

What I tried:

I tried to do a function that removed all accents & caps, then did a "str_replace" with the search term but found that the end result logically had no caps or special characters when I expected it to be just normal text but highlighted.

CodePudding user response：

you can try str_ireplace

echo str_ireplace($term_to_search, '<b>'.$term_to_search.'</b>', $string);

CodePudding user response：

You can use ICU library to normalize the strings. Then, look for term position inside handle string, to add HTML tags at the right place inside original string.

function highlight($string, $term_to_search, Transliterator $tlr) {
    $normalizedStr = $tlr->transliterate($string);
    $normalizedTerm = $tlr->transliterate($term_to_search);

    $termPos = mb_strpos($normalizedStr, $normalizedTerm);
    // Actually, `mb_` prefix is useless since strings are normalized

    if ($termPos === false) { //term not found
        return $string;
    }

    $termLength = mb_strlen($term_to_search);
    $termEndPos = $termPos   $termLength;
    
    return
        mb_substr($string, 0, $termPos)
        . '<b>'
        . mb_substr($string, $termPos, $termLength)
        . '</b>'
        . mb_substr($string, $termEndPos);
}

$tlr = Transliterator::create('Any-Latin; Latin-ASCII; Lower();');

echo highlight('Would you like a café, Mister Kàpêk?', 'kaPÉ', $tlr);